package com.xiaobai.excel.handler;

import com.alibaba.excel.enums.CellDataTypeEnum;
import com.alibaba.excel.metadata.Head;
import com.alibaba.excel.metadata.data.CellData;
import com.alibaba.excel.metadata.data.WriteCellData;
import com.alibaba.excel.write.metadata.holder.WriteSheetHolder;
import com.alibaba.excel.write.style.column.AbstractColumnWidthStyleStrategy;
import org.apache.poi.ss.usermodel.Cell;
import org.springframework.util.CollectionUtils;

import java.util.HashMap;
import java.util.List;
import java.util.Map;

public class CellWidthStyleStrategy extends AbstractColumnWidthStyleStrategy {


    private final Map<Integer, Map<Integer, Integer>> CACHE = new HashMap<>();
    private final Map<Integer, Integer> WIDTH_MAP;
    public CellWidthStyleStrategy(Map<Integer, Integer> WIDTH_MAP) {
        this.WIDTH_MAP = WIDTH_MAP;
    }

    @Override
    protected void setColumnWidth(WriteSheetHolder writeSheetHolder, List<WriteCellData<?>> cellDataList, Cell cell, Head head, Integer relativeRowIndex, Boolean isHead) {

        if (!CollectionUtils.isEmpty(WIDTH_MAP) && WIDTH_MAP.get(cell.getColumnIndex()) != null) {
            Map<Integer, Integer> maxColumnWidthMap = CACHE.computeIfAbsent(writeSheetHolder.getSheetNo(), k -> new HashMap<>());
            Integer maxColumnWidth = maxColumnWidthMap.get(cell.getColumnIndex());
            if (maxColumnWidth == null) {
                maxColumnWidthMap.put(cell.getColumnIndex(), WIDTH_MAP.get(cell.getColumnIndex()));
                writeSheetHolder.getSheet().setColumnWidth(cell.getColumnIndex(), WIDTH_MAP.get(cell.getColumnIndex()) * 300);

            }
            return;
        }

        Map<Integer, Integer> maxColumnWidthMap = CACHE.computeIfAbsent(writeSheetHolder.getSheetNo(), k -> new HashMap<>());
        if (isHead) {
            if(relativeRowIndex == 0){
                int length = cell.getStringCellValue().getBytes().length;
                Integer maxColumnWidth = maxColumnWidthMap.get(cell.getColumnIndex());
                if (maxColumnWidth == null || length > maxColumnWidth) {
                    maxColumnWidthMap.put(cell.getColumnIndex(), length);
                    writeSheetHolder.getSheet().setColumnWidth(cell.getColumnIndex(), length * 300);
                }
            }
        }else{
            Integer columnWidth = this.dataLength(cellDataList, cell, false);
            if (columnWidth >= 0) {


                if (columnWidth > 255) {


                    columnWidth = 255;
                }
                Integer maxColumnWidth = maxColumnWidthMap.get(cell.getColumnIndex());
                if (maxColumnWidth == null || columnWidth > maxColumnWidth) {


                    maxColumnWidthMap.put(cell.getColumnIndex(), columnWidth);
                    writeSheetHolder.getSheet().setColumnWidth(cell.getColumnIndex(), columnWidth * 256);
                }
            }
        }
    }

    private Integer dataLength(List<WriteCellData<?>> cellDataList, Cell cell, Boolean isHead) {


        if (isHead) {


            return cell.getStringCellValue().getBytes().length;
        } else {


            CellData<?> cellData = cellDataList.get(0);
            CellDataTypeEnum type = cellData.getType();
            if (type == null) {


                return -1;
            } else {


                switch (type) {


                    case STRING:
                        return cellData.getStringValue().getBytes().length;
                    case BOOLEAN:
                        return cellData.getBooleanValue().toString().getBytes().length;
                    case NUMBER:
                        return cellData.getNumberValue().toString().getBytes().length;
                    default:
                        return -1;
                }
            }
        }
    }
}
